SAA-C03 Question #70: Real Exam Question with Answer & Explanation

Question

An ecommerce company runs Its application on AWS. The application uses an Amazon Aurora PostgreSQL cluster in Multi-AZ mode for the underlying database. During a recent promotionalcampaign, the application experienced heavy read load and write load. Users experienced timeout issues when they attempted to access the application. A solutions architect needs to make the application architecture more scalable and highly available. Which solution will meet these requirements with the LEAST downtime?

Options

• ACreate an Amazon EventBndge rule that has the Aurora cluster as a source. Create an AWS
• BModify the Aurora cluster and activate the zero-downtime restart (ZDR) feature. Use Database
• CAdd additional reader instances to the Aurora cluster Create an Amazon RDS Proxy target group
• DCreate an Amazon ElastiCache for Redis cache. Replicate data from the Aurora cluster to Redis

Explanation

This solution directly addresses the scalability and high availability requirements with minimal Additional Reader Instances: Adding more reader instances to the Aurora cluster will distribute the read load, improving the performance of the application under heavy read traffic. Aurora reader instances automatically replicate the data from the writer instance, enabling you to scale out read operations. Amazon RDS Proxy: RDS Proxy improves database availability by managing database connections more efficiently and providing a connection pool. This reduces the overhead on the Aurora cluster during peak loads, further enhancing performance and availability without requiring changes to the application code. Why Not Other Options? Option A (EventBridge and Lambda): This doesn't directly address the performance and availability issues. Logging state changes and adding reader nodes on failure events doesn't provide proactive scalability. Option B (Zero-Downtime Restart and Activity Streams): Zero-Downtime Restart (ZDR) is useful for minimizing downtime during maintenance but doesn't directly improve scalability. Database Activity Streams are more for security monitoring than for performance enhancement. Option D (ElastiCache for Redis): While adding a caching layer can help with read performance, it introduces complexity and may not be necessary if additional reader instances can handle the

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